Typewriting machine



May 4, 1937. H J ||ART 2,079,013

TYPEWRITING MACHINE Filed 0G13. .21, 1955 2 Sheets-Sheet l INVENT'OR ,f5-4 ATTORNEYS H. J. HART May 4, 193 7.

TYPEWRITING MACHINE 2 Sheets-Sheet 2 Filed Oct. 2l, 1935 INVENTOR wif/WZ,

fg, ATTORNEYS.

Patented May 4, 1937 iuNir-E t STTS TSUPEWRITING Vrli/IAGHINE Application October 21, 1935, -Serial No. 46,015

13 Claims.

i HItis the common practice to provide an escapementiwhich is fully released for a step movement during the return movement ofthe spacing bar. Thus, itis necessary for `the operator to wait until after the spacing bar has been fully delo `pressed and returned to normal positionbefore actuating a key lever.

'I'he principal object of my invention is toprovide a carriage escapement mechanism which is fully releasable during the operating stroke of l5 an .operating lever, such as for instance, the spacing bar lever, thereby permitting the operation of a key lever prior to the spacing bar beginning its return movement.

In the drawings:

Figure l is a vertical sectional View, partly-in elevation, embodying my invention,

Figure 2 is an enlarged front elevation of the escapement mechanism,

Figure `3 is ahorizontal sectional view taken 25 on the line 3 3 of Figure 2,

`Figure 4 is an enlarged vertical .section taken `on the line 4--4 of :Figure 3. v

Figure 5 is a perspective viewof the interponent, and

Figures 6, 7 and 8 are enlarged detail plan Views showing diierent positions ofthe interponent duringA depression of thespacing bar.

Referring to the accompanying drawings, V'5 designates an escapement supporting frame of a typewriting machine having a carriage Ii supported thereon in the `usual manner. `The usual escapementv mechanism forv the carriage includes `a rack 'I which `is mounted on the carriage for cooperation'with a pinion v8 loosely mounted on a shaft 9 journaled in the frame 5, and fixed to said shaft is the usual escapement wheel ID hav- `ing a back dog Il pivotedV thereon `and yieldably :engaging the teeth of the pinion 8. A dog rockerilZ is fulcrumed on pivots I3, I3 to'swing about a horizontal axis, and mounted 4"on the rocker above the axis thereof are pivoted and `fixedlvdogs I4 and lrespectively which are successively engaged by the teeth of the escapement wheel` I `when the rocker'is rocked to feed the vcarriage step-by-step in letter space intervals. 4"The rockerV I2 -is normally held against rearward `swinging movement by a spring I6 whereby the lpivoted or limber dog I4 is normally held in enf5,5 -gagementWith/theescapement Wheel I0, the fixed (c1. 19tssi l dog I being normally disposed'in front of said wheel.

A spacing bar I'i is mounted on the front ends of-levers I3 (oneonlyrbeing shown) which are fulcrumed-asiat I9 on a bridge 20 rigidly connectedto-the side walls of the main frame of the machine, `one ofsaid-,levers terminating in an .upwardly Yextending rock arm 2l. In the broadsense, thetwo levers Iand the spacing bar Il constitutea manually depressible lever. A-rearwardly extendingspring 22 which is connected yat one end to the arm 2i and at the otherend to a studrZ-i fixed tothe machine frame, serves-to yieldably retain the spacing bar il and levers I8 against a stop Ita, and against depression.

`Abracket 2Q is attached to the frame 5 at oneside o-i the rocker I2, and a power transmitting lever 25 which extendsin `a general direction away from the rocker andin a plane parallel to the axis I9, is fulcrumed intermediate its ends on said bracket, as at 26, 26, to swing about a vertical axis. The powerend 2 of the lever 25 is connectedto the rock. arm 2i by a link 28. The other end..29 of thelever 25 is disposed in a-plane slightly in front of the rocker I2, and an interponent is fulcrumed intermediate its ends as at3l on said end 29 of the lever and has bodily movement with the latter. .The interponent includes a tail. 32 at one end and a nose 't3 having a concentric edge 3l! at the other end. A coil spring "35 is connected at one end to the end 29 of the lever125 and at its other end to the tail 32.of the interponent, and serves the dual function of (l) Vyieldably retainingrthe tail 32 against a stop on the end`29 of the lever`25 and'(2) Vyieldably retaining the concentric edge Sd" of Vthe nose'33'of the interponent in engagement with the front face of a laterally extending bearing arm vS'I'ixed to the upper portion of the 'i rocker I2. A fixed -abutment 38 which is preferably an integral part of the bracket 24, is located," in spaced relation to` and in rearof a laterally extending cam arm"`39V xed to the interpcnent.

arm`-3l ofthe rocker and that normally the `major axis of the interponent lies in aplane at substantially right angles to the general plane of the rocker I2.

It will be observed that in Figure 6 the interponent 30 and the dog rocker I2 are in their normal or rest positions; that in Figure 7 the transmitting lever 25 has been moved to shift the interponent rearwardly and to swing the it will be observed that the pivot 3l of the interponent is directly in front of the bearing sil() upper portion of the dog rocker rearwardly to permit the xed dog l5 to be engaged by the next tooth of the escapement wheel I0, that the interponent has been swung into a position whereby it is about to become disengaged from the dog rocker, and that this movement of the interponent is effected during the first portion oi the depression movement of the spacing bar, or in other words, during the operating stroke of the operating lever; and that in Figure 8 the lever 25 has been moved to its limit by reason of the spacing bar reaching the end of its depression movement, the interponent has been released from the dog rocker, and the latter has returned to its normal position with the limber dog I 4 in engagement with the tooth of the escapement wheel. l

From the foregoing, it will be understood that a complete step movement is imparted to the carriage during the depression of the spacing bar and prior to said bar reaching the end of said depression movement.

I claim:

1. In a typewriting or like machine, an escapement mechanism including an escapement wheel, a dog rocker, xed and movable dogs mounted on said rocker for alternately engaging the escapement wheel, and a spring for normally holding the rocker against movement; an operating lever; and means operated by said lever for rocking the dog rocker against the tension of the spring and for releasing said rocker during the operating stroke of said lever, said means including a bodily movable and pivotally mounted interponent normally and directly engaging said rocker and movable to disengage said rocker, a spring for normally retaining the interponent in engagement with the rocker, and means disposed in the path of movement of the interponent for swinging the latter out of engagement with the rocker.

2. In a typewriting or like machine, an escapement mechanism including an escapement wheel, a dog rocker, fixed and movable dogs mounted on said rocker for alternately engaging the escapement wheel, and a spring for normally holding the rocker against movement; an operating lever; and means operated by said lever for rocking the dog rocker against the tension of the spring and for releasing said rocker during the operating stroke of said lever, said means including a bodily movable and pivotally mounted interponent normally and directly engaging said rocker and movable to disengage said rocker and provided with a cam arm, a spring for normally retaining the interponent in engagement with the rocker, and a fixed abutment mounted for cooperation with the cam arm of the interponent for swinging the latter out oi' engagement with the rocker during the bodily movements of the interponent.

3. In a typewriting or like machine, an escapement mechanism including a dog rocker swingable about a horizontal axis, and a spring for normally holding the rocker against movement; an operating lever; and means operated by said lever for rocking the dog rocker against the tension of the spring and for releasing said rocker during the operating stroke of said lever, said means including a power transmitting lever mounted to swing about a vertical axis, and an interponent pivotally mounted on and bodily movable with said transmitting lever and normally engageable with said rocker, said interponent being swingable to disengage said rocker upon movement of said transmitting lever.

4. In a typewriting or like machine, an esoapement mechanism including a dog rocker swingable about a horizontal axis, and a spring for normally holding the rocker against movement; an operating lever; and means operated by said lever for rocking the dog rocker against the tension of the spring and for releasing said rocker during the operating stroke of said lever, said means including a power transmitting lever mounted to swing about a vertical axis, and an interponent pivotally mounted on and bodily movable with said transmitting lever and normally engageable with said rocker, said interponent being swingable to disengage said rocker upon movement of said transmitting lever, a spring for normally retaining the interponent in engagement with the rocker, and means disposed in the path of movement of the interponent for swinging the latter out of engagement with the rocker.

5. In a typewriting or like machine, an escapement mechanism including a dog rocker swingable about a horizontal axis, and a spring for normally holding the rocker against movement; an operating lever; and means operated by said lever for rocking the dog rocker against the tension of the spring and for releasing said rocker during the operating stroke of said lever, said means including a power transmitting lever mounted to swing about a vertical axis, and an interponent pivotally mounted on and bodily movable with said transmitting lever and normally engageable with said rocker, said interponent being swingable to disengage said rocker upon movement of said transmitting lever, said interponent being provided with a cam arm, a, spring for normally retaining the interponent,

in engagement with the rocker, and a fixed abut-` ment mounted for cooperation with the cam arm of the interponent for swinging the latter out of engagement with the rocker during the bodily movements oi the interponent.

6. In a typewriting or like machine, an escapement mechanism including a supporting frame, a dog rocker pivoted on said frame to swing about a horizontal axis, and a spring for normally holding the rocker against swinging movement; an operating lever; and means operated by said lever for rocking the dog rocker against the tension of the spring and for releasing said rocker during the operating stroke of said lever, said means including a power transmitting lever iulcrumed on the frame to swing about a vertical axis, operating connections between said levers, an interponent mounted on and bodily movable with the transmitting lever to swing about a vertical axis and normally engaging the dog rocker, said interponent being provided with a cam arm, a spring for normally retaining the interponent in engagement with the rocker, and a iixed abutment mounted on the frame and for cooperation with the cam arm of the interponent for swinging the latter out of engagement with the rocker during the bodily movements of the interponent.

7. In a typewriting or like machine, an escapement mechanism including an escapement wheel, a dog rocker, iixed and movable dogs mounted on said rocker for alternately engaging the escapement wheel, and a spring for normally holding the rocker against movement; a depressible spacing bar; and means operated by said bar for rocking the dog rocker against the tension of the spring and for releasing said rocker during the depressing movement of said bar, said means including a bodily movable and pivotally mounted interponent normally engaging said rocker and movable to' disengage said rocker, a spring for normally retaining the interponent in engagement with the rocker, and means disposed in the path oi' movement of the interponent for swinging the latter out of engagement with the rocker.

8. In a typewriting or like machine, an escapement mechanism including an escapement wheel, a dog rocker, xed and movable dogs mounted on said rocker for alternately engaging the escapement wheel, and a spring for normally holding the rocker against movement; a depressible spacing bar; and means operated by said bar for rocking the dog rocker against the tension of the spring and for releasing said rocker during the depressing movement of said bar, said means including a bodily movable and pivotally mounted interponent normally engaging said rocker and movable toI disengage said rocker and provided with a cam arm, a spring for normally retaining the interponent in engagement with the rocker, and a xed abutment mounted for cooperation with the cam arm of the interponent for swinging the latter out of engagement with the rocker during the bodily movements of the interponent.

9. In a typewriting or like machine, an es- 'capement mechanism including a dog rocker swingable about a horizontal axis, and a spring for normally holding the rocker against movement; a depressible spacing bar; and means operated by said bar for rocking the dog rocker against the tension of the spring and for releasing said rocker during the depressing movement of said bar, said means including a power transmitting lever mounted to swing about a vertical axis, and an interponent pivotally mounted on and bodily movable with said transmitting lever and normally engageable with said rocker, said interponent being swingable to disengage said rocker upon movement of said transmitting lever.

l0. In a typewriting or like machine, an escapement mechanism including a dogr rocker swingable about a horizontal axis, and a spring for normally holding the rocker against movement; a depressible spacingk bar; and means operated by said bar for rocking the dog rocker against the tension of the spring and for releasing said rocker during the depressing movement of said bar; said means including a power transmitting lever mounted to swing about a vertical axis, and an interponent pivotally mounted on and bodily movable with said transmitting lever and normally engageable with said rocker, said interponent being swingable to disengage said rocker upon movement of said transmitting lever, a spring for normally retaining the interponent in engagement with the rocker, and means disposed in the path of movement of the interponent for swinging the latter out of engagement with the rocker.

11. In a typewriting or like machine, an escapement mechanism including a dog rocker swingable about a horizontal axis, and a spring for normally holding the rocker against movement; a depressible spacing bar; and means operated by said bar for rocking the dog rocker against the tension of the spring and for releasing said rocker during the depressing movement of said bar, said means including a power transmitting lever mounted to swing about a vertical axis, and an interponent pivotally mounted on and bodily movable with said transmitting lever and normally engageable with said rocker, said interponent being swingable to disengage said rocker upon movement of said transmitting lever, said interponent being provided with a cam arm, a spring for normally retaining the interponent in engagement with the rocker, and a xed abutment mounted for cooperation with the cam arm of the interponent for swinging the latter out of engagement with the rocker during the bodily movements of the interponent.

12. In a typewriting or like machine, an escapement mechanism including a supporting frame, a dog rocker pivoted on said frame to swing about a horizontal axis, and a spring for normally holding the rocker against swinging movement; a depressible spacing bar; and means operated by said bar for rocking the dog rocker against the tension of the spring and for releasing said rocker during the depressing movement of said bar, said means including a power transmitting lever fulcrumed on the frame to swing about a vertical axis, operating connections between said bar and lever, an interponent mounted on and bodily movable with the transmitting lever to swing about a vertical axis and normally engaging the dog rocker, said interponent being provided with a cam arm, a spring for normally retaining the interponent in engagement with the rocker, and a fixed abutment mounted on the frame and for cooperation with the cam arm of the interponent for swinging the latter out of engagement with the rocker during the bodily movements of the interponent.

13. In a typewriting or like machine, an escapement mechanism including a dog rocker, and a spring for normally holding the rocker against movement; a depressible spacing bar and a lever supporting said bar; and means operated by said bar for rocking the dog rocker against the tension of the spring and for releasing said rocker during the depression movement of the bar, said means including a transmitting lever, a link connecting the spacing bar lever and the transmitting lever, and an interponent pivotally mounted on and bodily movable with said transmitting lever and normally engageable with said rocker, said interponent being swingable to disengage said rocker upon movement of said transmitting lever.

HENRY J. HART. 

